(18) باب الْيَمِينِ فِيمَا لاَ يَمْلِكُ، وَفِي الْمَعْصِيَةِ، وَفِي الْغَضَبِ
Narrated Abu Musa Al-Ash`ari:
I went along with some men from the Ash-ariyin to Allah's Messenger (ﷺ) and it happened that I met him while he was in an angry mood. We asked him to provide us with mounts, but he swore that he would not give us any. Later on he said, "By Allah, Allah willing, if ever I take an oath (to do something) and later on I find something else better than the first, then I do the better one and give expiation for the dissolution of my oath."
Reference: Sahih al-Bukhari 6680
In-book reference: Book 83, Hadith 57
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 8, Book 78, Hadith 671